Tone is relative to each of our ears. I build basses, and IMO there is a difference of attack in woods that typically only the player can tell the difference. Only the player's brain when playing can know when an intended note attack is about to fire a sequence of nerves, the exact moment when the finger leaves the string and the developing tone that happens afterwards. http://en.wikipedia.org/wiki/Janka_hardness_test
Rosewood at 1780 is a harder wood than hard maple at 1450
There is a difference. Strings vibrate. Gravity and potential energy slow down the string after attack. Then look at what it contacts: Nut, Frets}both secured to the fb to a neck (maple), and the bridge secured to the body (generally the same hardness or less than the neck. Metal will transfer most all of the vibrations only hindered by resonant frequencies that absorb parts of the original vibration from the string. these vibrations arguably make the vibrations more pleasing to the ear (as we don't play to many all metallic guitars). the vibrations with wooden augmentations subtracted from the string are only translated by the pickups as the pickups are the only thing that transfer the string vibrations into electric signal.
The fb is just a part of the bass, the bass that responds the way you want it is the one you want. I am an educated player(Berklee), a luthier(Nordstrand), and a bass nerd this is my opinion based on facts. I think the main thing is that gear especially on this site is what we are focusing on, Its not that big a deal - long story short.
IME Rosewood has a slower attack, has a softer high end extension, has a different sweet spot with the tone knob, and is easier to maintain but can be more stable.
Maple I think is a neutral as it gets and also easy to manipulate with other woods. I like maple fingerboards better. Faster attack, harder and extended high end, usually has a full coat of finish (this can effect tone a lot) vs oil finish or high end finishing. In reference to a fender Large scale manufactures not just fender buy a lot of maple so quality check do get missed. is this scenario stability issues are common but comes with a warranty. Fender necks shrinks a lot, when rosewood ships it is usually precut into blanks to stability is generally better.